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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f07f4efe2eeee0c1869cc5ca32bac91a88713ac14b27deab6a493db0a4129453' 
  AND token = '07iATLvrydsvLGO4hUXjfBBL2ck3mj/Ji9ejU8YwP4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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