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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '588fa9bd6569cea204bb6f4c6c5e38d6f802d4a63c817e11cd270e81b2f6fba0' 
  AND token = 'Ff7ae/SUfqQE9f6ll6b238JeFHQuql6kLmp0I0+4t2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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