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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '39eaa083c44f287e6634723048e3ba303289d9b44d6a916e22fdd8f833d457bc' 
  AND token = 'aSvXSlA443lTy1/YPcz8p2LrolTDJXEyXFloTGetlwQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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