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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '966e38485aca519a1d16a3abdb5a8aa298548a54835c7c3a7190694e958c5f13' 
  AND token = 'Nnx/loH/E6cJ3VXT23PspnsSR01A+VPmRjPYpgG/Kx4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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