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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '92efe310d31ce4c2f0705f6b91593a88b66861fb8a622cf6811c1dac143806c8' 
  AND token = 'Cg4c6kpKdYkeZrQVr6MBSHWYLF5d87V/qFssYmwTB9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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