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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '945e5b28ba69305dd6163394ca0f106ab1f8aafc84f47515bc91ab9bb7700b12' 
  AND token = '59gmXS9u4jV0rFlO5/s56yulhwQfAglLUUNrPU1LoaQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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