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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8957da8129307bbd96e71261bd3ed92d4a7c9b9c55a761fa877afb73c847f5ed' 
  AND token = 'IBTA5sCAS7wxaI5KJj7qPQ18dBLzkU2UsIMPbPm42Vo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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