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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a917dba2fc50bc223ab0bb16269196f882263a112ad1b7aa044bd714c460c853' 
  AND token = 'qhP/3Fe9u/mD/fSiLDgT3QF3CtGA7iDIbNLkTumV594=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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