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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f852dca2ada70c593b1bcf9134d5df5583d591c5a0d6f7f813f0bee7e95bd43f' 
  AND token = 'VCYGIQ1xQ+gSc6zgT1jQWSRyF8lpmieFVj+mIVaLk0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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