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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b2ce40aab0d008df73d437d8763a6a4da52975b6411a4fc8f1e41e18f67071bf' 
  AND token = '+snovqneJL4m0L1979xvh79HBqL5frdNZDxvAZr/AKo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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