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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f368384912eda6df64ac896e7b1c1ca3425cfe8ffa72c52f58fbc2f727428e26' 
  AND token = 'vHCHGSqr+mixwaLVyRtOOGdwd1LkKSPTzyGxTcLM8cc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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