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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f69b361905d42ee7062ba8f008e0cf2f90136d306278f5d8a2347aa85e5d2988' 
  AND token = '93QtdF/wLKf5VblYlmKqygEcqLFAYycSpUkDx2YMgqo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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