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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '478b9a028ec2fcb36043f10c3fa7df595fcbe370040b5c994d4a53c33f16a736' 
  AND token = 'st/4hJV097UgClL4Ju3yY2Qn+ED4HX6HKMt1SmmcQ+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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