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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0e1ab270c21ea6a4515e1e964328dcab3e731059dc25b567da98c3d5838cc629' 
  AND token = 'KVjMx6NegUi1ZDSEimNZX3cK+VmepAKp03urt5Xr6go=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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