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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '06b21827ea5b3829e0b913e582a6b8ff1fd8328be22b19b053a1728f93559039' 
  AND token = '46ahBO4pc3SY8Ye/tGtacKWfL9u26loEs1gI3LuEHA8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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