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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6cdfffc606057fac648399efc801911dd1ba84449d901d5f439a430634c8be5c' 
  AND token = '1Yn4RpVfrq68DGZiZemqQlsmY/sIepqXIyFS/dENkNE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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