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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ec778570fe70ca2743de0fa4a9d82e98c2d088142b9f2b1d55812c1305c3c85f' 
  AND token = 'RhIkBLGOPoVM35PX86Xh7IYDeAgRXtP9X4rswLwyLDE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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