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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '96745aa108a5a3ed50ac389e3aa487c4574aa4bc5522cb93927ce84ede33562c' 
  AND token = 'sQLmberZJ/l0nSjyE5Nf7bkBol99qP+6DolaSYh73Y0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}