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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'aceea567da75310fe814c677d5b82fb6e278aa38b44f17735aa1d4b7383e1b43' 
  AND token = 'D6cSiKiT9yW7mRecoueip25qJjQeUTE28dN9hGFMMWQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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