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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ebe1fca98358e51f708d8354dc676942ae5a04a28f4702e2a14ac87c27409412' 
  AND token = '1kny76v8h6TOVfIcMJvCAXBqrhr4d0K7wS+Sov/Ib4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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