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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e862342f7440281d439ab96b3d56e6db5458a7e4e3b2a6ad3cf3ab7e7970ecec' 
  AND token = 'R+zi7nHKiWzOMlf4VGIOW+4H03aWXhGVHCrioTKAzJQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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