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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f7ba309109d4e01ce9f1d8381d497d393b428e78617292fad4ba9f0f0ff3f3fd' 
  AND token = 'ZDV3Tf2/Y2pG9qHXH3Ba0ew5WdHk0CyzqPlyTbZAVKE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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