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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '85b665f8bf627ac65913ff1bc5c3389a68c0d66c47893a155a424ece7df48fb3' 
  AND token = 'kDYl3Ycd5h4rcEnYfQGoxgBNQPu86yOFQmJSNfZHjRs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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