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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9c90e6bde784d2b8795de280bd1692b435dd121f6129285425caf5151cf4741d' 
  AND token = 's1tb6zgprM/L1rmRQ5kqCrjkQRFKPOL4aEAPuGhaJck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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