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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2a0a3a1eb95d6ece89d001a0d6b71ce73b98cc054c7070ea7b12cbaf66dbd29b' 
  AND token = 'qThxH9psYQcu3a68Ntq3gpbZAR26mf6/jIbq2siuBO8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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