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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c7d4131fd63949d122a2ef0ff254944ae35a570e4b87c35c1e0e45916e655245' 
  AND token = 'wlYHP4amdSf2egE09C5913QqL4Xyo99DWQWfJt6NLX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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