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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '328a8ddf5d5c1ef0e4428dae5e1a081c163b5a72465bb56ffa66c20474756705' 
  AND token = 'fNufTPLaFhhMwExX0ZZ/2ABu6kscTLgGdNy+vFplit8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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