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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4f9f6d00b207c9031e3bb187b1c05f0abf1b29138b42912930daa7bc32d98190' 
  AND token = 'ykut3vvqKEUNFVPDJZCbSiKLpoMilFPgzF95i8CRQXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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