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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c1dd6dece53d2d5a9d6821e21faa040583a8df32ee71d8c0aacdedb8a9ee67b2' 
  AND token = 'c5u8qXogL58Y2nAtEcsawCxbWllZbAgG3o9dNcTmNDw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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