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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5c627adfe316088f4a2c50c8855af88a8a8b7348412fc1859c93c075d314696a' 
  AND token = '76Fj8vAq2xo3jZAZmJUV/Jc5bD4KtKbeb356UZp7Njg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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