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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a658c8446c597655ee3fac8579f02ed0e6f42666c5d69dab2749b907f16ea0b6' 
  AND token = 'bO33jac+r2CYZDnzT2o2mMH0LCvNDeu43bAW0jRJZCU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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