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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '36da431631223aef21666d27a4f70b36582acdfdd933cf40dd2c7fea3d3f801a' 
  AND token = '160G1L1XCGp56COVvcStm8c/3SbC2WfSaCMBsrJCioY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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