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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0ec55abc56040fc39f2336b18a4b844a60dd5b312dcee51d93599114fd1e4114' 
  AND token = 'd5tcO2i+I0HAxSl9XXjqkA/MCaYQEoL6aB5+/c2uMVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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