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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ae8407ddb05241bfc12e8fa75e3afa9ec7d8a8eecd9758a19333e7544f36d7e7' 
  AND token = '+cxRf2iD74iNjWE8RPciINMe6mCnJXTsRmhqLBWCeOQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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