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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '73fcb6bcb31c6fa601cee639d2c7caeb5373908ce3d787fbb0b1c858e87938dc' 
  AND token = '7guFs+ufK/iJZNnoKw+Fk4hNTlYR+o3LOlBOLJx7KN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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