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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1fcaf8e2d3142ebcedf9394f7f99131858c6858e6470bcdb1a1de1d4f0faca8b' 
  AND token = 'aqAskemYT7kgESCnzR91g9vJX7x8ouwjue8Dk9nkjeE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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