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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '70bf08e22ff2740832db76e0f463bab8b5632b3cae4e239e0a72fc07a1383bc2' 
  AND token = '07/Y/HHyXi2k7wRSjjE3ISdtcZstgbe4m7r/FIehmks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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