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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f84cf6534232eaf763a35761e5dc05ce1fb4788caeea3485e64e0e9726560022' 
  AND token = 'cpNRFDXtNKUIJ2zc6Z3k49LFj1nCw3fsxJ3EEdpqahg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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