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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b7a0f8afca459aa8ce1b6ac63eb8ca3adc992531e8c2b0f1e86b8afca8ef5969' 
  AND token = 'RHse3hmTpP/9ikvbOxfqpXSSJWZCMu2Za/K+6dLH/9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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