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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ee3a3ea108ec2905fee40b40f906148511ac819b034661847fac3618b9b1260d' 
  AND token = '6C+9V/qm2lXi5MJeHDRXWuNGnDRF5wReHnjx0Td5jQ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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