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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4089ce85e8bd1695c5b0b11d3e8168d71f71f26698076ed731252f7b5f9f80e2' 
  AND token = 'r8Yshcz4uTLbPvaPJryr0j7+/e4NiPzg0H1o5tptj0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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