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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bb63750d3f7644d066e1c974074b22280774fab3a35b6a4b9349b3c5cdd45bf2' 
  AND token = '5kYhEkF6COqUp7p8gLp81uatyr7hmh+jImtTmnASNz8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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