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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ba8b883f41faa90903b47f89e6b7b2644190645f016cc74311e8dc46e8c8f945' 
  AND token = 'UjybMJrc0jKuPE3sqhsNDMof3W47s+30L1afjwL0Z9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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