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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ab963d846c47e2ad6ebeb8929c4a669a6bca8921df73e0cc762331c8039016b8' 
  AND token = 't4Lcm/cCinNjqSPqU55YHy3GZ391ORxJaPj22IvUqAQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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