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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '01fc861edad96b643b2ac137ebe02d62e07dd9d3531e03fe9b1458fcab475062' 
  AND token = 'pMloCYHaCElrEKRdFLE/1dhXekC2ezc4I5GIjQKH/Eg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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