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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8f55a68ba2a34fdaed9522211f3c99ab9f35d71af08732683aadc9d2c552b7f9' 
  AND token = 'oVMHkKLCyd4wCRHIeG0g48nzLi2upSkr8u/pShUL2as=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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