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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0a2c944d250db4af4f949ddd0a74fdc422d2d83f95d7527479fabc907351c844' 
  AND token = 'uqvZYXFqO2Fs/2R1maN1iBXXn771ogrJkcB7lG+4zJM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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