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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4aeef8a6cedd3ad20de72bd80dae427b720eef25b95bc0b5cab21ab3412b86aa' 
  AND token = 'ot0aQ+Xl9IUT3vivsO/ssFkBSe3P31fuMHFnK6DH7jY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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