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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5f4a61a417ea3c3157b707ebf1c3f9a24cb4a87d4dafd01fc466a12fced8b83e' 
  AND token = 'FaafZYPe3cf10PFv144mRZ57fpTV2ij8Q36RAKPR+nY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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