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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '66afb710f0e1615b56f53ac3e83952f8a93daa63e84b6a8ffac555a87b2728e2' 
  AND token = 'KFTBCbbjQ+q5tCnT2cBi6Lt0y1OauuVtd/i2cddAaAM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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