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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3bc237640ee1c00af8782bae976bff7767f47f6eca0e48a8de1aefa2e74311c1' 
  AND token = 'lKDJMlQui+3nluNwEqMvxsq326XyUYcJZLk1gTwwX5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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