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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cc99763c70a1ab0b4e721ec1ab0267b7262c64b58a2e6d27bf2a72bde9c16090' 
  AND token = 'jPl9X7jqmM2N1yPsytwqocW2OeMdD7Y5asSIuFmVwCU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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