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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2c0d19151d45dda82c7a45a46f049c6639f43d35dc7f9af00297b30b6b7d47d1' 
  AND token = 'BEHGRkMMcse5Q4iW6s276bso0s9mnlp5p+QaBRyeOkE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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