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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '91f965c1740eba4a23dcb22738132c43541b0c5fa3d41b1b2a7fdedb184c95bc' 
  AND token = 'iJL/tTokjLLO22/pC/azVRu0q0ZVYO6k/2CiXl9bCkE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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