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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0006394ae58805a81c7b1bdf58f59ddac46e5ca0b16f42b9ecf04ae59a7ce205' 
  AND token = 'a/vS6ODDu/dYe/re1MdnTD8iyyDPRViWgEORurypcRc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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