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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '48c9a508f588b679d4ecf5fb62f895866fafd39e6e9c805b937b9826577003e7' 
  AND token = 'ZEv0x0Owe4ao7AcPEsiEGGNS23FIy2jtqytfVEQM6VU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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