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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '88553872fefbb2a05a3b0c809de6f71d759f0103652a5b90390b98bbd242dcb5' 
  AND token = '+X9PuK7u2Q4jOe5PylyOxdTZa055cw5HCKX+STexZhU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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